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J. Korean Ceram. Soc. > Volume 45(11); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(11): 750.
doi: https://doi.org/10.4191/kcers.2008.45.1.750
인공경량골재의 표피층 구조가 흡수된 물의 방출속도에 미치는 영향
경기대학교 신소재공학과
Effect of Shell Structure of Artificial Lightweight Aggregates on the Emission Rate of Absorbed Water
Seung-Gu Kang
Department of Materials Engineering, Kyonggi University
The artificial aggregates with dense surface layer (shell) was fabricated and the dependence of water emission rate upon the shell structures was studied. The EAF dust containing many flux components and waste white clay with ignition loss of above 48% were used as for liquid phase and gas forming agents during a sintering process respectively. In addition, the shell structure was modified with various processes and the modification effect on water emission rate was analyzed. The pores under $10{mu}m$ were found in the sintered artificial light aggregates and disappeared by incorporating to a bigger pore during re-sintering. The water emission rate in an initial step depended on a void content of aggregates filled in a bottle rather than a shell structure. But, after 7 days where the water emission of the aggregate with a shell is above 40%, the shell of aggregates suppressed the water emission. The core of aggregates was exposed and most shell was lost when crushed to smaller size so, the ability for suppressing water emission of the crushed aggregates decreased. The activation energy for the water emission was $3.46{pm}0.25{times}10^{-1}$J/mol for the most specimens showing that the activation energy is irrelevant to the pore size distribution and shell structure.
Key words: Artificial lightweight aggregates, Shell, Emission rate, Pore distribution, Void content
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